. Which of the following are not state functions

(I) q+w

(II) q

(III) w


(a) (I), (II) and (III)

(b) (II) and (III)

(c) (I) and (IV)

(d) (II), (III) and(IV)


Best Answer

Correct Option is : (b)

State functions or state variables depend only on the state of the system and not on the path taken by it.

For example, internal energy of a body is given by q+w, change in internal energy between A and B will be the same when either of paths are taken.

state functions

Path function depends on the path followed during a process. Work and heat are path functions.

For example, considering the same graph, work done by a body is given by area under p-v graph along v. Thus work done in path I will be different from that of path II. Therefore work is a path function.

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